If you want to stay with current equipment, how much would you have to increase to chord of the wing to achieve your desired wing loading? This may be a way to achieve your goal.

Ken

No kidding on the cost. To go from 5 gram servos to the 2.5 is about 3.5 times the cost. To go from the Blue Wonder to the motors the F3P guys are using multiply the cost by 5 to 8 times. Yikes, my inner cheapskate is getting upset.

I was thinking of some possible ways to save weight. Can the tail feathers be 6mm or even 3mm epp? Can the fuselage be 6mm epp? Can the wing be be milled out to save weight? Instead of milling can the wing be built with a skeleton of 6mm epp and a skin of 3mm epp?

I bought a 16 gram motor from Hobby City I'd like to try, but it seems to start very rough...not sure if I trust it.

Hi Leadfeather,
I have the Ikarus shockflyer, fly really cool, this built the srcahbuilt.
I like built other, and I see you mod plane.
I used in my ikarus 370 bhusless, with gear box gear D the GWS.
Rx arrow
esc 18 amp
servos hs-55 in aileron and elevatos, tail blue bird.
Lipo TP 730mah.

Images

I bought a 16 gram motor from Hobby City I'd like to try, but it seems to start very rough...not sure if I trust it.

Leadfeather,

I have 4 of Lazertoyz' 10AX ESCs which will not start my 16 gram motor smoothly... one simply won't start it at all!! Three of the four do start & run the 24 gram 'blue wonder' motor OK. (The other one is very rough trying to start the same 24 gram motor, so it is being sent back.)

I replaced the 10AX ESC with a TURNIGY Plush 10A ESC, and was very happy to find that it starts my 16 gram motor very smoothly and very consistently. So I'd suggest getting one of those ESC's from HobbyCity, along with the $6.95 programming card that makes setup SOOOOO easy.

I also have replaced another ESC that was not starting another motor smoothly with another of the Turnigy Plush 10A ESC's, and it also works smoothly & perfectly in that aircraft too. So for the smaller motors that aren't being started smoothly by some inexpensive ESCs, I'll give my endorsement to the line of TURNIGY Plush ESCs!

But I'll warn you- it'll spoil you being able to so easily & quickly adjust all of the various programming settings with the card if you've been twiddling transmitter sticks to do this job previously!

Viking thanks for the advice, I'll have to give it a try; especially since it is still a pretty economical way to reduce weight. In the HC reviews of this motor there are claims of 300 gr of thrust. If I could get any where near that it would be more than enough for the Yak.

What are your thoughts and opinions of the 16 gram motors performance with the Turnigy esc? Would the 6A esc be adequate?

If you have to rewind your 16g motor (and trust me you will, I've done seven so far) because of the broken wire syndrome, you'll notice it's terminated delta and the 6A works great. BUT.....to make it easy I went with 20 and 21 turns terminated 'Y' and the Turnigy 6A hated it. Needed a 9A TB to get it working properly, althought I haven't tried a Turnigy 10A on one yet after a fix-me-up. Got sick of rewinding mine and my FB motors as getting the wire off is a nightmare. So, I solved the broken wire problem by adding a small solder board like the el-cheapo TP motors use.

Better still, I went with the C2024 at 17g and I modded the wobbly, no more broken wire blues, more power and less amps. It doen't come purple as pictured, is completely different and in gold n' chrome, and labelled 'Turnigy'.

Images

Viking thanks for the advice, I'll have to give it a try; especially since it is still a pretty economical way to reduce weight. In the HC reviews of this motor there are claims of 300 gr of thrust. If I could get any where near that it would be more than enough for the Yak.

What are your thoughts and opinions of the 16 gram motors performance with the Turnigy esc? Would the 6A esc be adequate?

It's rated as a "70 watt" motor; that, divided by 11.1 volts for a 3S pack, comes out to 6.3 Amps. If you don't prop it to draw that much current, you'll do fine. (I'm using the 10A ones myself- I don't remember how many grams lighter the 6A one is, & haven't used one yet... I just know the 10 Amp one works very smoothly. Hope this helps.

The 16g can't take a joke at indoor, smack the floor or walls with it when it's still spinning and you'll shave the wires off between the inside of the front end and the end of the stator from flexing, as there's not much space between them. Or, they break at the bearing tube from flexing and vibration. Other then the solder board and less wire inside, they suck. That's why I went with #27 wire and 20 or 21 turns 'Y' for more room or another flavor of motor with better quality.

Hi Leadfeather,
I have the Ikarus shockflyer, fly really cool, this built the srcahbuilt.
I like built other, and I see you mod plane.
I used in my ikarus 370 bhusless, with gear box gear D the GWS.
Rx arrow
esc 18 amp
servos hs-55 in aileron and elevatos, tail blue bird.
Lipo TP 730mah.

The 16g can't take a joke at indoor, smack the floor or walls with it when it's still spinning and you'll shave the wires off between the inside of the front end and the end of the stator from flexing, as there's not much space between them. Or, they break at the bearing tube from flexing and vibration. Other then the solder board and less wire inside, they suck. That's why I went with #27 wire and 20 or 21 turns 'Y' for more room or another flavor of motor with better quality.

Gold, I have one that is rewound for the same reason, the wires at the front rubbed against the bell and shaved the insulation off. I rewound it similar to that described in the timocharis blog it spins, but stutters at start up, haven't put it on a plane yet, will try it with a Turnigy esc though.

I think that 6mm EPP would work fine for everything. I have a 32" Extra built that way and it flies superb. You do need to add some carbon truss work the the fuse to keep the rear end from twisting during rolls but that is not hard to do.

I think that 6mm EPP would work fine for everything. I have a 32" Extra built that way and it flies superb. You do need to add some carbon truss work the the fuse to keep the rear end from twisting during rolls but that is not hard to do.